One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,7)(9,10)(11,13)(12,14)(15,16)(17,18,23,21,22,25,20,30)(19,26,27,28,29,24,31,32)(1,2,4,5)(3,7,8,6)(9,11,12,15)(10,13,14,16)(17,19)(18,24)(20,31)(21,32)(22,29)(23,27)(25,26)(28,30)(10,14)(13,16)(17,19)(18,24)(20,31)(21,32)(22,29)(23,27)(25,26)(28,30) involution — undirected(1,3,4,8)(2,6,5,7)(17,20,22,23)(18,21,25,30)(19,27,29,31)(24,28,26,32)(17,21,23,25,22,30,20,18)(19,28,27,24,29,32,31,26)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.